Most of our kits are underdriven, which means the accessories are driven slightly slower to reduce parasitic losses. GFB pulley kits are designed to improve acceleration by reducing the rotational mass (inertia) on the crankshaft as well as parasitic loads from the driven accessories. The effect is similar to a lighter flywheel, and the engine feels more lively and willing to rev.
We know that people are sometimes concerned about possible adverse effects of lightweight pulleys and underdriving, but rest assured we have done our homework! The underdrive ratios have been optimised to ensure there are NO adverse effects on the performance of the accessories, and whilst it is true that some engine types do suffer harmonic issues from lightweight pulleys, we steer clear of those. The kits we release are thoroughly application tested and do NOT cause engine damage in the short or long term.
Fitments:
- SUBARU Impreza 2.0 Turbo GT EJ20T MY94-00
- SUBARU WRX MY97-98
- SUBARU XT MY09-13
- SUBARU GT MY98-00
- SUBARU GT BL-BP EJ255 MY06-09
- SUBARU XT MY03-04 (Series I)
- SUBARU WRX MY06-07 (Aka "Hawkeye")
- SUBARU STi MY03-07
- SUBARU XT MY05-08 (Series II)
- SUBARU STi MY99-00
- SUBARU B4 (BE, BH, BT) EJ20TT MY98-03
- SUBARU WRX MY99-00
- SUBARU Impreza 2.0 Turbo GT EJ205 MY98-00
- SUBARU WRX MY01-02 (Aka "Bugeye")
- SUBARU GT MY01-02
- SUBARU STi MY02 (Aka "Bugeye")
- SUBARU Liberty/Legacy GT MY10-14 (BM, BR)
- SUBARU GT BL-BP EJ20T MY03-06
- SUBARU WRX MY03-05 (Aka "Peanut Eye")
- SUBARU WRX MY08-14
- SUBARU STi MY08-13
- SUBARU STi 2014-On (EJ25 Engine)